Prime Minister-elect Christopher Luxon said taking 10 days since special votes had been counted to negotiate the formation of a government wasn't a bad thing.
Speaking to Newstalk ZB's Heather du Plessis-Allan, Luxon said it was "not long at all, especially when you think of the Dutch taking 10 months to do something very similar and having the government fall apart after 11 months".
Luxon said getting every party to sign off commitments was exciting.
"We want to get into it," he said.
He promised there would be no changes to National's tax plan - "all that changes is the way we go about funding it because we agreed with New Zealand First not to pursue the foreign buyers tax".
"There's a number of policy changes and policies [in the agreement] that means you make additional revenue and make additional savings.
He said it was "no biggie" he had had to drop the foreign buyers tax.
"New Zealanders will get the tax relief we talked about delivering for them," he said.
Funding for those tax cuts would come from "little things", he said. He mentioned changing the fees-free scheme for tertiary education, saying it could save $100 million.
"These are a series of things that all add up. All in all, what people need to know is the tax programme has been committed to by all three parties.
Luxon said, "it was difficult before the election because everyone said you're not going to raise enough money, or you're going to raise too much money, the reality was we were relaxed about it going into negotiations because we said we'd build buffer into our fiscal plan".
He said the government wouldn't be borrowing money to fund the cuts.
He also said the regional infrastructure fund was different to the Provincial Growth Fund.
"Both National, Act and New Zealand First had commitments to investing in regional New Zealand, he said.
"What we've done here is this is a capital budget. It can only be spent on hard infrastructure. It's a lot smaller than what was agreed in the Provincial Growth Fund."
On the Treaty Principles Bill, Luxon said there was no commitment to support the bill beyond select committee.
"There is no further commitment from the Government beyond that," he said.
We want to strengthen democracy, we want equal citizenship - Luxon
On scrapping two iwi seats on the Environment Canterbury regional council, Luxon said, "we just don't think it's one person, one vote".
"We really said very clearly we want to strengthen democracy, we want equal citizenship, and those were positions of all three parties, essentially, before going into the election," he said.
Luxon said he was looking forward to returning to Auckland this evening and having a sleep-in tomorrow.
He said he gets up at 4.30am every day and tends to work quite late.
"As you can imagine, it's been a big job, turning the National Party around in the past two years. We managed to go to the campaign, and then the day after the campaign we started thinking about all this.
"I think this is pretty historic. It's really special. For the first time, we've got a three-party coalition government in New Zealand. We've got a situation where we've had every party sign up to the detail of the policy programme, we've agreed on the ways of working, and we've put the right people in the right places.
"This is what you spend the last three years in politics trying to do, is to make sure we can get to government."